104 lines
2.4 KiB
Go
104 lines
2.4 KiB
Go
package cmap
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import "sync"
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// Map represents a map safe for concurrent use
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type Map[K comparable, V any] struct {
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mutex sync.RWMutex
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data map[K]V
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}
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// New creates a new generic Map
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func New[K comparable, V any]() *Map[K, V] {
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return &Map[K, V]{data: map[K]V{}}
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}
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// Put puts the key-value pair into m
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func (m *Map[K, V]) Put(key K, value V) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.data[key] = value
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}
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// GetHas returns the corresponding value for the given key in m
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// as well as a bool indicating if a value was present at all
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func (m *Map[K, V]) GetHas(key K) (V, bool) {
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m.mutex.RLock()
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defer m.mutex.RUnlock()
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value, ok := m.data[key]
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return value, ok
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}
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// Get returns the corresponding value for the given key in m
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func (m *Map[K, V]) Get(key K) V {
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value, _ := m.GetHas(key)
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return value
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}
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// Has returns a bool indicating if a value was present for the given key
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func (m *Map[K, V]) Has(key K) bool {
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_, ok := m.GetHas(key)
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return ok
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}
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// Delete deletes the key-value pair from m
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func (m *Map[K, V]) Delete(key K) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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delete(m.data, key)
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}
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// Count returns the amount of key-value pairs currently stored in m
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func (m *Map[K, V]) Count() int {
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m.mutex.RLock()
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defer m.mutex.RUnlock()
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return len(m.data)
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}
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// Iter calls f for every key-value pair stored in m.
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// Be aware that this locks m for write access
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// as pointer types could be modified in f
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func (m *Map[K, V]) Iter(f func(key K, value V)) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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for key, value := range m.data {
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f(key, value)
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}
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}
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// Keys returns a slice containing all currently stored keys in m.
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// Pointer values are returned as they were received
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func (m *Map[K, V]) Keys() []K {
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m.mutex.RLock()
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defer m.mutex.RUnlock()
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keys := make([]K, 0, len(m.data))
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for key := range m.data {
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keys = append(keys, key)
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}
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return keys
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}
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// Values returns a slice containing all currently stored values in m.
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// Pointer values are returned as they were received
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func (m *Map[K, V]) Values() []V {
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m.mutex.RLock()
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defer m.mutex.RUnlock()
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values := make([]V, 0, len(m.data))
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for _, value := range m.data {
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values = append(values, value)
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}
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return values
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}
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// Do calls f with the underlying primitive map.
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// Be aware that this locks m for write access
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// so Do can be used for reading as well as modifiying m.
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func (m *Map[K, V]) Do(f func(m map[K]V)) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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f(m.data)
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}
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